<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            box-sizing: border-box;
            padding: 0;
            margin: 0;
        }
        .container {
            border: 1px solid black;
            margin: 0 auto;
            display: grid;
            width: 90vw;
            height: 90vh;
            grid-template-columns: 100px 1fr;
            grid-template-rows: 100px 1fr 100px;
            grid-template-areas: 
            "header header"
            "sidebar main"
            "footer footer";
            grid-gap: 10px;
        }
        header,aside,main,footer {
            background: aqua;
        }
        header {
            grid-area: header;
        }
        aside {
            grid-area: sidebar;
        }
        main {
            grid-area: main;
        }
        footer {
            grid-area: footer;
        }
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
                grid-template-areas:  
                "header"
                "sidebar"
                "main"
                "footer";
            }
        }
        .TZ {
            margin: 0 auto;
            border: 1px solid black;
            width: 650px;
            height: 450px;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(2, 1fr);
            justify-content: space-around;
            align-content: space-around;
            position: relative;
        }
        .tz {
            margin: 10px;
            border: 1.5px solid black;
            font-size: 200;
            font-weight: 1000;
            position: relative;
        }
        .tz1_1 {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }
        .tz2 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(3, 1fr);
        }
        .tz2 p {
            top: 0;
            bottom: 0;
            left: 0;
            right: 0;
            margin: auto;
            text-align: center;
        }
    </style>
</head>
<body>
    <div class="container">
        <header>Header</header>
        <aside>Aside</aside>
        <main>
            <p>Main</p>
            <div class="TZ">
                <div class="tz">
                    <p class="tz1_1">·</p>
                </div>
                <div class="tz tz2">
                    <p>·</p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p>·</p>
                </div>
                <div class="tz tz2">
                    <p>·</p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p>·</p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p>·</p>
                </div>
                <div class="tz tz2">
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                    <p></p>
                    <p></p>
                    <p></p>
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                </div>
                <div class="tz tz2">
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                </div>
                <div class="tz tz2">
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                    <p>·</p>
                    <p></p>
                    <p>·</p>
                </div>
            </div>
        </main>
        <footer>Footer</footer>
    </div>
</body>
</html>